This is a lesson about using craters to indicate the age of a planetary surface. Learners will simulate the process of cratering by using falling water drops to make craters in fine silica sand. Then, they will compare the cratered surfaces they...(View More) produce with pictures of the surface of Mars. As an extension, learners will examine a more complex Mars image and apply what they have learned about Mars to the analysis of the surfaces of other worlds. This is Actividad 3.7 as part of El Universo a Sus Pies, a Spanish-language curriculum available for purchase.(View Less)

This is an activity about comet motion. Learners will cut out images of Halley's Comet, putting the images in sequential order to create a flip book demonstrating the comet's orbit around the Sun and the formation of the comet's tail near the Sun....(View More) This is Activity E-3 of Universe at Your Fingertips 2.0: A Collection of Activities and Resources for Teaching Astronomy DVD-ROM, which is available for purchase.(View Less)

This is an activity about comet motion. Learners will cut out images of Halley's Comet, putting the images in sequential order to create a flip book demonstrating the comet's orbit around the Sun and the formation of the comet's tail near the Sun....(View More) This is Actividad 5.4 as part of El Universo a Sus Pies, a Spanish-language curriculum, available for purchase(View Less)